In an alternate timeline created when SG-1 journeyed to ancient Egypt and changed history, Dr. Hirschfield was Carter's supervisor at her job at the Department of Aerospace Research Headquarters in Washington, DC. Hirschfield had used Carter's theories on spin wave technology and the effects of antigravity on electromagnetism, and had taken credit for them as his own, however Carter could not bring herself to confront him face to face about the plagiarism before she was summoned to Cheyenne Mountain by the Air Force.
Portrayed by: James Purcell
Cross Reference: Time Travel 3000 BC
Episode Reference: Moebius